Lock for step-ladder chairs.



No. 677,052; 7 Pdte'nfe'd lune 25, 190i. L. BAUMEB, LOOK FOR STEP LADEERCHAIRS.

(Application filed (No Model.)

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UNITED STATES PATENT OFFICE.

LOUIS BAUMER, OF JOHNSTOWN, PENNSYLVANIA.

LOOK FOR STEP-LADDER CHAIRS.

SPECIFICATION forming part Of Letters Patent No. 677,052, dated June 25,1901.

Application filed March 29, 1901. Serial No. 53,495. (No model.)

To all whom it may concern.-

Be it known that I, LOUIS BAUMER, a citizen of the United States,residing at J ohnstown, in the county of Cambria, State of Pennsylvania,have invented certain new and useful Improvements in Looks for Step-Ladder Chairs, of which the following is a specification, referencebeing had therein to the accompanying drawings.

This invention relates to a lock for stepladder chairs, and particularlyto a device adapted to lock and hold the chair in either of its adjustedpositions.

The invention has for its object to provide a lock comprising a singlemember simple in construction and operation, pivotally mounted upon arelatively. fixed part of the chair and adapted to engage lockingmembers carried by a movable portion of the chair when in its differentadjusted positions.

Other objects and advantages of the invention will hereinafter appear inthe following description and the novel features thereof will beparticularly pointed out in the appended claim.

In the drawings, Figure 1 represents the chair in the form of astep-ladder. Fig. 2 is a similar view with the parts arranged as achair. Fig. 3 is an elevation of the locking device, and Fig. at is alongitudinal section of the locking device.

Like letters of reference indicate like parts throughout the severalfigures of the drawings.

Theletter A designates a step-ladder chair,

which may be of any ordinary and desired construction, composed of asection A, pivoted to the base A and carrying the rear or back leg A andthe back-supporting standards A while the portion Ais provided with thefront leg A which is always relatively fixed to the movable portion A inits several adjusted positions. The fixed and movable portions of thechair are pivoted in any desired manner for instance, as shown at A sothat when in the position shown in Fig. 1 a step-ladder is formed, whilewhen folded into the position shown in Fig. 2 a chair is provided. Thedetails of construction of these parts are common in the art, and theinven tion is in no wise limited to the same.

The locking device B is provided at one end with a pivoting-socket B,and upon the opposite sides thereof locking-recesses B and B areprovided. In the structure shown recesses are used; but it will beobvious that any other desired engaging device may cooperate with thepins or projections O and O, secured, respectively, at the upper andlower portions of the standard, which forms the back of the chair whenin the position shown in Fig. 2. The locking device or plate may beprovided with a stiffening-rib for instance, as shown at B -and suitablyornamented in any desired manner. This device is pivoted to therelatively fixed member of the chair, preferably to the leg A by meansof the ap erture B. and adapted to swing upon that pivot, so as to bringeither the recess B in engagement with the pin 0, Fig. 1, to lock theparts in position as a ladder, or by swinging the'plate completely overthe recess B is brought into engagement with the pin C. These recessesare shown as located at difierent distances from the pivotal point ofthe plate,which distances may be varied, dependent upon the-distance ofthe locking-pins C and G from the pivotal point B of the locking 'deviceB.

From the foregoing description the operation of the parts will beclearly understood, and it will be further understood that the lockingdevice is adapted to lock and hold the chair in either of its adjustedpositions by a single simple plate so mounted upon a relatively fixedpart as to engage separate and independent locking members upon amovable or adjustable part. It will further be seen that the device isof such a character that it can be applied to chairs of thisconstruction now in use by the simple insertion of a retaining-screw andthe locking-pins for engagement with the plate.

Having described my invention, What is claimed is- A step-ladder chaircomprising relatively fixed and movable members, locking projectionsupon opposite end portions of said movable member, aplate pivotallymounted upon I In testimony whereof I afiix my signature said fixedmember of the chair and provided in presence of two witnesses.

upon its opposite faces with lockin sockets disposed at a distance fromthe pivotal point LOUIS BAUMER' 5 to permit engagement with either ofsaid pi'o- \Viinesses:

jeotions to lock the chair in its adjusted po- WILL. J. LAMBERD,

sitions; substantially as specified. A. G. RIPPLE.

